Fastener kalma ce ta gaba ɗaya don nau'in sassa na injina da ake amfani da su lokacin da aka haɗa sassa biyu ko fiye (ko abubuwan haɗin gwiwa) tare gaba ɗaya.Nau'ikan kayan ɗamara da suka haɗa da bolts, studs, screws, goro, screws, screws na katako, zoben riƙewa, wanki, fil, gungu, da sol...
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